I just knocked all of the rivets out of my R&M 11530 fan blade. I wanted to either roll the kinks out of the blades or make new ones if plan a fails. Also to my disappointment the hub is brass plated steel and the brass is peeling off. Not sure what I'm going to do about that. Brass powder coat maybe...
Anyway, not knowing any better, I removed all the blades and not marking any positions. I now know that the blades are all slightly different lengths. I'm assuming this is for balancing. What do I do now? Maybe it would make the most sense to seek a different blade.

If it was me, I would get a bunch of little nuts and bolts with the bolts that fit into the rivet holes.
Use all the same length, diameter, same metal, so they are all the same weight.
Tighten finger tight. Put the blade on a Dubro 499 prop balancer and move the wings around until it
is in balance. Try to get it close, then rivet the wings on the hub. Put it back on the Dubro and balance
by grinding the trailing edge of the heavy wing or wings with a 1" belt sander.
Good luck with what you decide to do...
Happy Fanning